The two brothers accused of spraying bullets into a Mother’s Day second-line parade last year, injuring 20 people though killing none, face additional counts along with five other defendants named in a superseding indictment issued Thursday by a federal grand jury.

The indictment replaces one from February that named nine people, including alleged Mother’s Day shooters Akein “Keemy” Scott, 21, and Shawn “Shizzle” Scott, 25, in a heroin- and cocaine-trafficking conspiracy said to date back more than seven years.

Federal prosecutors say the defendants are members of the “FnD” gang, named for their stomping grounds around Frenchmen and North Derbigny streets in the 7th Ward.

Both the old and new indictments include allegations that the two brothers “did knowingly use and carry a firearm during and in relation to a drug-trafficking crime” on May 12, 2013, when 19 people were shot and another person was trampled in the Mother’s Day shooting. Authorities claim the shooting spree was part of a larger drug feud in the area.

Added to the indictment handed up Thursday were new firearms charges related to four separate shootings from March 22, 2012, to Aug. 4, 2012.

Stanley “Stizzle” Scott, Akein Scott, Jeremiah “Rocky” Jackson, Travis “Trap” Scott and Shawn Scott each face at least one additional count. All of the defendants are in federal custody, according to U.S. Attorney Kenneth Polite’s office.

Also named in the indictment are Brian “Dub” Benson and Crystal Scott.

Two of the nine original defendants in the federal case, Gralen “Dooley” Benson and Richmond “Ace” Smith, have pleaded guilty in the past few months and are excluded from the new indictment.

Smith pleaded guilty to conspiracy to possess and use firearms in furtherance of a drug-trafficking crime. In a signed “factual basis” in August to support his guilty plea, Smith said Travis Scott was the leader of the FnD gang and the other indicted men were FnD members who sold heroin, crack cocaine, marijuana and other illegal drugs at the Frenchmen Meat Market.

Smith said he sold heroin there from 2007 until New Orleans police arrested him in 2009, then returned in 2012 — after a prison stint on gun and drug counts — to again peddle drugs in the area.

FnD members “controlled an area bounded by Elysian Fields Avenue, North Johnson Street, the I-10 interstate, St. Anthony Street and North Claiborne Avenue,” Smith’s factual basis states. “No other individuals could sell illegal drugs in that neighborhood without the permission of Travis Scott and FnD.”

Gralen Benson pleaded guilty to a pair of conspiracy counts. He also admitted selling heroin at the Frenchmen Meat Market around 2006 or 2007. After numerous drug arrests and jail stints, he went back to the neighborhood and began selling heroin “fronted” to him by Travis Scott, he admitted.

According to his factual basis, Benson was shot in the hand on March 25, 2012, during a shooting that Travis Scott, Akein Scott and Jackson perpetrated.

Neither Benson nor Smith has been sentenced.

Federal prosecutors are asking U.S. District Judge Ivan Lemelle to postpone a trial in the case by four months due to the new indictment.

Follow John Simerman on Twitter, @johnsimerman.